GB2237065A - Electromagnetic i.c. engine fuel injector outlet - Google Patents

Electromagnetic i.c. engine fuel injector outlet Download PDF

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Publication number
GB2237065A
GB2237065A GB9022020A GB9022020A GB2237065A GB 2237065 A GB2237065 A GB 2237065A GB 9022020 A GB9022020 A GB 9022020A GB 9022020 A GB9022020 A GB 9022020A GB 2237065 A GB2237065 A GB 2237065A
Authority
GB
United Kingdom
Prior art keywords
valve
axis
supply orifice
end portion
fact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9022020A
Other versions
GB9022020D0 (en
Inventor
Massimo Lolli
Maurizio Boaro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weber SRL
Original Assignee
Weber SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weber SRL filed Critical Weber SRL
Publication of GB9022020D0 publication Critical patent/GB9022020D0/en
Publication of GB2237065A publication Critical patent/GB2237065A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0675—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages
    • F02M51/0678—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages all portions having fuel passages, e.g. flats, grooves, diameter reductions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The outlet 6 is inclined to the injector axis a and is elliptical at the downstream end. The face 9 of the metal or plastics bush 10 which is upstream when the injector is mounted in an engine intake passage (17, Fig. 1) is chamfered to reduce air flow disturbance. <IMAGE>

Description

C) E,- ES 1 1 ' PERFECTED ELECTROMAGNETIC FUEL METERING AND ATOMIZING
VALVE FOR AN INTERNAL COMBUSTION-ENGINE FUEL SUPPLY DEVICE The present invention relates to an electromagnetic fuel metering and atomizing valve employed on an internal combustion engine fuel supply device.
Known valves of the aforementioned type substantially comprise an annular body housing an electromagnet and from the front end of which projects an injection nozzle coaxial with the body and having a fuel supply orifice controlled by a plunger operated by the electromagnet.
Valves of this type are fitted in seats on the manifold supplying the air and fuel mixture to the engine cylinders. so as to inject inside the same. and at a given point upstream from each intake valve, a given quantity of atomized fuel which mixes with the air fed into the manifold for forming the air and fuel mixture.
The axis of the plunger-controlled fuel supply orifice on the injection nozzle is substantially coincident with the body and nozzle axes. so that the direction of the atomized fuel jet from the supply orifice is substantially coincident with the valve axis. For producing a homogeneous mixture of atomized fuel and air inside the intake manifold, the axis of the atomized fuel jet must be substantially coincident with the axis of the manifold portion downstream from the valve, thus preventing fuel from being projected onto, and depositing on, the surface of the manifold.
For this to be achieved, each valve axis must form a tight angle in relation to the axis of the manifold portion downstream from the valve, a geometrical requirement which results in numerous drLwbacks.
Foremost of these are the complex design of the valve seats, and the very small diameter imposed on the valve body and. in particular the nozzle, which poses serious problems in terms of valve design.
The aim of the present invention is to provide an electromagnetic fuel metering and atomizing valve of the aforementioned type, designed to overcome the aforementioned drawbacks.
With this aim in view,, according to the present invention, there is provided an electromagnetic fuel metering and atomizing valve for an internal combustion engine fuel supply device, said valve comprising an annular body housing an electromagnet and from the front end of which extends an injection nozzle coaxial with said body and having a fuel supply orifice controlled by a plunger operated by said electromagnet; characterised by the fact that at least the end portion of said supply 1 1 orifice forms an angle of over 0' and less than 60 in relation to the longitudinal axis of said body and said nozzle, so that the atomized fuel jet produced by said valve is inclined in relation to said axis.
A non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
Fig.1 shows a schematic section of a portion of the air manifold of a fuel supply device featuring the valve according to the present invention; Fig.2 shows a partially-sectioned side view of the valve according to the present invention; Fig.3 shows a front view of the valve according to the present invention.
The valve according to the present invention provides for metering and atomizing fuel on an internal combustion engine fuel supply device. Said valve. which in itself is substantially known, presents an annular body 1 defining an inner cavity (not shown) housing an electromagnet. From the front end of said body 1. there projects an injection nozzle 2 coaxial with body 1 and having a fuel supply orifice 3 controlled by a plunger 4 operated in known manner by said electromagnet. Immediately upsteam from orifice 3,r there is conveniently formed a substantially conical seat 5 for the end of plunger 4.
According to the present invention, at least the end portion 6 of supply orifice 3 forms an angle of over 0' and less than 60 in relation to the longitudinal axis OaR of body 1 and nozzle 2, said angle conveniently being 30.
End portion 6 of supply orifice 3 comes out through a surface 7 of nozzle 2. perpendicular to the axis of body 1. As shown clearly in Fig.2. the portion of nozzle 2 not occupied by end portion 6 of supply orifice 3 is removed in the form of a chamfered portion 8 conveniently presenting a surface 9 lying in a plane perpendicular to that of axis "a" of body 1 and axis nb" of end portion 6 of supply orifice 3, and inclined at conveniently 45 in relation to the axis of body 1.
The valve preferably comprises a bush 10 fitted onto the front end of nozzle 2 and in which are formed both end portion 6 of supply orifice 3 and chamfer 8. As shown in Fig.3.. at least the end section 11 of end portion 6 of supply orifice 3 is. not circular. but conveniently elliptical, the shorter half axes of said ellipse lying in the plane containing axis waw of body 1 and axis Obw of end portion 6 of supply orifice 3.
Bush 10 conveniently comprises a collar 12 force-fitted onto the end of nozzle 2, as shown in Fig.2.
operation of the valve is as follows.
The valve is fitted inside a seat 16 on the intake manifold 17. with a sealing ring 18 between the valve and outer surface of nozzle 2. The top end of the valve is connected to a fitting 19 by which it is supplied with fuel. The valve must be so assembled inside seat 16 1 1' air-fuel mixture and that axis "bn of end portion 6 Of Supply orifice 3 lies in the same plane as the axis of portion 20 of manifold 17 downstream from seat 16.
By so doing, the jet 21 of atomized fuel issuing from the valve is substantially directed along axis ObO of end portion 6 of supply orifice 3, i.e. is substantially coincident with the axis of portion 20 of manifold 17. Consequently, the atomized fuel particles are directed into the center of the air stream flowing along said portion 20 of manifold 17, thus forming a homogeneous substantially preventing the atomized fuel from being directed and condensing on the surface of portion 20 of manifold 17. The air stream inside manifold 17 is substantially unaffected by the presence of nozzle 2 (or bush 10) by virtue of chamfer 8, which provides for considerably reducing the resistance created by the portion of nozzle 2 projecting inside manifold 17.
The flare angles of the jet, measured in the plane containing axes nan and Ob" and in the perpendicular plane containing axis nbn. have been found to differ, the flare angle of the jet from section 11 being greater in the second of the above two planes. This is due to the geometry of end portion 6 of supply orifice 3 and. in particular. to the substantially elliptical shape of end section 11, the longer half axes of which lie in the second plane.
A wide-angle jet in said plane provides for producing a i ' homogeneous atomized fuel and air mixture.
Bush 10 may be made of any materiali conveniently plastic. If made of metal, end portion 6 of supply orifice 3 may be produced via electroerosion.
Even if formed inside bush 10, end portion 6 of supply orifice 3 may be formed directly on nozzle 2.
To those skilled in the art it will be clear that changes may be made to the design and arrangement of the component parts of the valve as described herein without, however, departing from the scope of the present invention p 1 J r 1 X

Claims (1)

  1. An electromagnetic fuel metering and atomizing valve for an internal combustion engine fuel supply device, said valve comprising an annular body (1) housing an electromagnet and from the front end of which extends an injection nozzle (2) coaxial with said body (1) and having a fuel supply orifice (3) controlled by a plunger (4) operated by said electromagnet; characterised by the fact that at least the end portion (6) of said supply orifice (3) forms an angle of over 0' and less than 60 in relation to the longitudinal axis (a) of said body (1) and said nozzle (2), so that the atomized fuel jet produced by said valve is inclined in relation to said axis (a).
    2) - A valve as claimed in Claim 1. characterised by the fact that said end portion (6) of said supply orifice (3) comes out through a surface (7) of said nozzle (2) perpendicular to said axis (a) of said body (1); the portion of said nozzle (2) not occupied by said end portion (6) of said supply orifice (3) being removed in the form of a chamfer (8).
    3) - A valve as claimed in Claim 2, characterised by the fact that said chamfer (8) presents a surface (9) lying in a plane perpendicular to the plane containing said axis (a) of said body (1) and the axis (b) of said end portion (6) of said supply orifice (3); said surface (9) being inclined in relation to said axis (a) of said body (1) - 4) - A valve as claimed in Claim 1, characterised by the fact that it comprises a bush (10) fitted onto the front end of said nozzle (2) and presenting said end portion (6) of said supply orifice (3) and said chamfer (8).
    5) - A valve as claimed in one of the foregoing claims, characterised by the fact that at least the end section (11) of said end portion (6) of said supply orifice (3) is not circular.
    6) - A valve as claimed in Claim 2, characterised by the fact that said end section (11) is substantially elliptical, the shorter half axes of said ellipse lying in the plane containing said axis (a) of said body (1) and said axis (b) of said end portion (6) of said supply orifice (3).
    7) - A valve as claimed in one of the foregoing Claims, characterised by the fact that said angle formed by said end portion (6) of said supply orifice (3) in relation to said axis (a) of said body (1) is an angle of 30.
    8) - A valve as claimed in one of the foregoing Claims from 2 to 7. characterised by the fact that said bush (10) comprises a collar (12) force-fitted onto the end of said nozzle (2).
    9) - An electromagnetic fuel metering and atomizing valve. substantially as described and illustrated herein with reference to the accompanying drawings.
    Published 1991 at The Patent OfIlce. State House. 66/71 High Holborn. London WC I R 47P. Further copies may be obtained from Sales Brwwb. Unit 6. Nine Mile Point. Cwmrclinfach. Cross Keys. Newport. NPI 7HZ. Printed by Multiplex techniques lid. St Mary Cray, Kent.
GB9022020A 1989-10-17 1990-10-10 Electromagnetic i.c. engine fuel injector outlet Withdrawn GB2237065A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT05341789U IT221658Z2 (en) 1989-10-17 1989-10-17 IMPROVING THE VALVES FOR DOSING AND PULVERIZING ELECTROMAGNETICALLY OPERATED FUEL FOR A FUEL SUPPLY DEVICE OF AN INTERNAL COMBUSTION ENGINE.

Publications (2)

Publication Number Publication Date
GB9022020D0 GB9022020D0 (en) 1990-11-21
GB2237065A true GB2237065A (en) 1991-04-24

Family

ID=11282576

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9022020A Withdrawn GB2237065A (en) 1989-10-17 1990-10-10 Electromagnetic i.c. engine fuel injector outlet

Country Status (4)

Country Link
DE (1) DE4032425A1 (en)
FR (1) FR2653181A1 (en)
GB (1) GB2237065A (en)
IT (1) IT221658Z2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5419297A (en) * 1994-06-28 1995-05-30 Siemens Automotive L.P. Extended tip gasoline port fuel injector
DE19712591A1 (en) * 1997-03-26 1998-10-01 Bosch Gmbh Robert Fuel injector and method for manufacturing and using a fuel injector
US5878962A (en) * 1997-09-24 1999-03-09 Siemens Automotive Corporation Pressure swirl injector with angled cone spray for fuel injection
WO2008084502A1 (en) * 2007-01-09 2008-07-17 Ucal Fuel Systems Limited Internal combustion engine with provision for mounting injector on itself

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1414371A (en) * 1972-01-06 1975-11-19 Renault Electro-magnetically operated ball-type fluid injectors
GB2148388A (en) * 1983-10-25 1985-05-30 Lucas Ind Plc Electromagnetic gasoline injector
EP0321313A2 (en) * 1987-12-18 1989-06-21 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Internal combustion engine for a vehicle
EP0328277A1 (en) * 1988-02-05 1989-08-16 Lucas Industries Public Limited Company Fuel injector
EP0361359A1 (en) * 1988-09-27 1990-04-04 FIAT AUTO S.p.A. A multi-nozzle injector for an internal combustion engine
GB2225384A (en) * 1988-10-28 1990-05-30 Weber Srl I.c. engine fuel injector outlets

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB611620A (en) * 1945-11-13 1948-11-02 Texaco Development Corp Improvements in or relating to the operation of internal combustion engines having airless injection of fuel
DE3407545A1 (en) * 1984-03-01 1985-09-05 Hubert 8500 Nürnberg Keiczek Fuel injection nozzle for internal-combustion engines
US4657189A (en) * 1985-03-13 1987-04-14 Aisan Kogyo Kabushiki Kaisha Electromagnetic fuel injection valve for an internal combustion engine having a plurality of intake valves
JPH025753A (en) * 1988-06-23 1990-01-10 Aisan Ind Co Ltd Fuel injection valve and nozzle thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1414371A (en) * 1972-01-06 1975-11-19 Renault Electro-magnetically operated ball-type fluid injectors
GB2148388A (en) * 1983-10-25 1985-05-30 Lucas Ind Plc Electromagnetic gasoline injector
EP0321313A2 (en) * 1987-12-18 1989-06-21 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Internal combustion engine for a vehicle
EP0328277A1 (en) * 1988-02-05 1989-08-16 Lucas Industries Public Limited Company Fuel injector
EP0361359A1 (en) * 1988-09-27 1990-04-04 FIAT AUTO S.p.A. A multi-nozzle injector for an internal combustion engine
GB2225384A (en) * 1988-10-28 1990-05-30 Weber Srl I.c. engine fuel injector outlets

Also Published As

Publication number Publication date
GB9022020D0 (en) 1990-11-21
DE4032425A1 (en) 1991-04-18
IT221658Z2 (en) 1994-07-25
IT8953417U1 (en) 1991-04-17
IT8953417V0 (en) 1989-10-17
FR2653181A1 (en) 1991-04-19

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)